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Nov., 1908 NESTING' NOTES FROM THE IIUACHUCA MOUNTAINS 233 material. Not enough had yet been placed to show up. The Grace Warbler was immediately forgotten in view of the more engaging prospects. The female was evidently using some cobweb. After it was placed to her satisfaction the male took a turn at re-arranging it. During all the time I watched him he did this and sev- eral times he brought material which he invariably dropped, none of it ever finding its way into the nest. On June 5 the female was sitting. She did not leave the nest until touched. The four eggs were slightly incubated. In size they compare very closely with the Western Warbling Vireo. They are considerably smaller than those of the Plumbeous. The spots are rather large, some larger than a pin head. They are not as black as the spots on either Western Warbling or Plum- beous, rather, a sienna brown. The nest is a wonderful piece of bird architecture. It is composed of a frame work of fine grass holding together a thick mat of oak down almost as compact as ./ felt. The prongs of the fork are entirely covered with the down held on by cob- webs. There is a scanty lining of fine grass tops. As is the case with the Plum- beous, the seeds are all removed from the grass tops used in the lining. The nest has a yellowish appearance. On May 22 another bird was seen building, the nest being almost completed, apparently. June 3d no bird was around and June 12th, when I again visited it, the nest had entirely disappeared. Not a vestige was left. I climbed up to exam- ine the fork where it had been and it was cleaned off completely. I feel sure they had moved the nest to some oak bush near by, but I could not locate it. Both these nests were about twelve feet from the ground, near the top of the same kind of oak brush. On June 10th an intruding Jay helped me locate a nest with three wll-featll-